linux-kernel - [Resned/PATCHv5 0/2] Serial fixes

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Date:	Wed, 15 May 2013 21:05:36 +0530
From:	Sourav Poddar <sourav.poddar@...com>
To:	<gregkh@...uxfoundation.org>, <tony@...mide.com>,
	<rmk+kernel@....linux.org.uk>, <khilman@...aro.org>
CC:	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Sourav Poddar <sourav.poddar@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Felipe Balbi <balbi@...com>, Rajendra nayak <rnayak@...com>
Subject: [Resned/PATCHv5 0/2] Serial fixes

Hi Greg,

I have rebased this patch series on top of 3.10-rc1.

This patch series contains fixes around the issue that
the console UART should not idled on suspend while using 
"no_console_suspend" in bootargs.

The approach thought of is to modify the serial core/serial driver to bypass
runtime PM if the UART in contention is a console and we are using "no_console_suspend"
in our bootargs.

There were discussions about how to handle "no_idle_on_suspend" issue and all the
discussions are as follows:
https://lkml.org/lkml/2013/4/5/239
https://lkml.org/lkml/2013/4/2/350
https://lkml.org/lkml/2013/3/18/199
https://lkml.org/lkml/2013/3/18/295
Due to the amount of change in approach, I am posting
this as a new series.

v4->v5
1. Add comments
2. Formatting.

v3->v4
1. check for console in runtime api.

v2->v3
1. Use "-EBUSY" for no_console_suspend case
2. Bypass runtime PM only during suspend
3. Improve the commit log based on community suggestion.

v1->v2
1. Remove the prepare/complete callback.
2. Adapt runtime PM callback to deal with the issue.
3. Fold patch(1,2) of previous series into 1.
4. Reordered the patch.
5. Change $subject and chage log for few patches.

Cc: Santosh Shilimkar <santosh.shilimkar@...com>
Cc: Felipe Balbi <balbi@...com>
Cc: Rajendra nayak <rnayak@...com>

Test info
Omap4430sdp:
- Tested wakeup from UART after suspend for dt and non dt case.
Omap5430evm:
- Tested wakeup from UART after suspend for dt case.

These patches were the part of the bigger series[1]. Breaking them into
two relevant series as they go through the different tree.

[1]: http://lkml.org/lkml/2013/4/26/274
---------------------------------------------

The following changes since commit b973425cbb51e08301b34fecdfd476a44507d8cf:

  Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 (2013-05-14 09:30:54 -0700)

are available in the git repository at:

  git://gitorious.org/linux-connectivity/linux-connectivity.git serial_fix_resend

Sourav Poddar (2):
      driver: tty: serial: Move "uart_console" def to core header file.
      driver: serial: omap: prevent runtime PM for "no_console_suspend"

 drivers/tty/serial/mpc52xx_uart.c |   10 ----------
 drivers/tty/serial/omap-serial.c  |   34 +++++++++++++++++++++++++++++++++-
 drivers/tty/serial/serial_core.c  |    6 ------
 include/linux/serial_core.h       |    7 +++++++
 4 files changed, 40 insertions(+), 17 deletions(-)

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